LETTER: Beautiful display in evening sky

I wonder if any of your other readers noticed the beautiful circumzenithal arc high in the sky early on the evening of Wednesday, June 25.
By The Newsroom
Published 3rd Jul 2014, 07:00 BST
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This fairly rare ‘upside-down’ rainbow is caused by a refraction of sunlight through horizontally-oriented ice crystals, generally in cirrus clouds. It forms a quarter of a circle centred on the zenith and on the same side as the sun.

Cirrus clouds which cause a ‘sun dog’ can cause a circumzenithal arc when they reach the zenith, if the sun is low in the sky.

V.M. Lloyd (Mrs)

Ash Road, Southwater